llvm/lib/ExecutionEngine/Orc/SectCreate.cpp

   1 //===--------- SectCreate.cpp - Emulate ld64's -sectcreate option ---------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/ExecutionEngine/Orc/SectCreate.h"
  10
  11 #define DEBUG_TYPE "orc"
  12
  13 using namespace llvm::jitlink;
  14
  15 namespace llvm::orc {
  16
  17 void SectCreateMaterializationUnit::materialize(
  18     std::unique_ptr<MaterializationResponsibility> R) {
  19   auto G = std::make_unique<LinkGraph>(
  20       "orc_sectcreate_" + SectName,
  21       ObjLinkingLayer.getExecutionSession().getTargetTriple(),
  22       getGenericEdgeKindName);
  23
  24   auto &Sect = G->createSection(SectName, MP);
  25   auto Content = G->allocateContent(
  26       ArrayRef<char>(Data->getBuffer().data(), Data->getBuffer().size()));
  27   auto &B = G->createContentBlock(Sect, Content, ExecutorAddr(), Alignment, 0);
  28
  29   for (auto &[Name, Info] : ExtraSymbols) {
  30     auto L = Info.Flags.isStrong() ? Linkage::Strong : Linkage::Weak;
  31     auto S = Info.Flags.isExported() ? Scope::Default : Scope::Hidden;
  32     G->addDefinedSymbol(B, Info.Offset, *Name, 0, L, S, Info.Flags.isCallable(),
  33                         true);
  34   }
  35
  36   ObjLinkingLayer.emit(std::move(R), std::move(G));
  37 }
  38
  39 void SectCreateMaterializationUnit::discard(const JITDylib &JD,
  40                                             const SymbolStringPtr &Name) {
  41   ExtraSymbols.erase(Name);
  42 }
  43
  44 MaterializationUnit::Interface SectCreateMaterializationUnit::getInterface(
  45     const ExtraSymbolsMap &ExtraSymbols) {
  46   SymbolFlagsMap SymbolFlags;
  47   for (auto &[Name, Info] : ExtraSymbols)
  48     SymbolFlags[Name] = Info.Flags;
  49   return {std::move(SymbolFlags), nullptr};
  50 }
  51
  52 } // End namespace llvm::orc.